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CO2 capture capacity of tetraethylenepentamine (TEPA)supported on beta zeolite, SiO2, and A12O3 has been studied by transient flow switching approaches and temperature programmed desorption (TPD) technique coupled with diffuse inflared reflectance Fourier transform spectroscopy (DRIFTS)and mass spectrometry (MS).Adsorbed CO2 on these solid amines can be characterized as weakly and strongly adsorbed CO2.